diff --git a/examples/developer-tools/src/index.html b/examples/developer-tools/src/index.html
index e4a4ab6b8..0e45982eb 100644
--- a/examples/developer-tools/src/index.html
+++ b/examples/developer-tools/src/index.html
@@ -149,7 +149,7 @@ <h2>
               <h2>
                 Code Headers
                 <md-icon-button
-                  class="action-button"
+                  class="action-button copy-button"
                   data-owner-id="code-headers"
                   aria-label="Copy code">
                   <md-icon>content_copy</md-icon>
@@ -161,7 +161,7 @@ <h2>
               <h2>
                 Block Definition
                 <md-icon-button
-                  class="action-button"
+                  class="action-button copy-button"
                   data-owner-id="block-definition"
                   aria-label="Copy code">
                   <md-icon>content_copy</md-icon>
@@ -175,7 +175,7 @@ <h2>
               <h2>
                 Generator Stub
                 <md-icon-button
-                  class="action-button"
+                  class="action-button copy-button"
                   data-owner-id="generator-stub"
                   aria-label="Copy code">
                   <md-icon>content_copy</md-icon>